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首页> 外文期刊>Surveys in Geophysics: An International Review Journal of Geophysics and Planetary Sciences >Requirements Analysis for Future Satellite Gravity Mission Improved-GRACE
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Requirements Analysis for Future Satellite Gravity Mission Improved-GRACE

机译：未来卫星重力任务改进的GRACE需求分析

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摘要

The Earth's gravitational field from the Next-Generation Gravimetry Mission (NGGM) and the Improved-Gravity Recovery and Climate Experiment (Improved-GRACE) complete up to degree and order 120 is recovered by a closed-loop numerical simulation using different orbital altitudes of 325 and 300 km, different orbital inclinations of 96.78A degrees and 89A degrees and different inter-satellite ranges of 10 and 50 km. The preferred orbit parameters of the future twin Improved-GRACE satellites are proposed based on the results of the simulations in this study. The research results show: (1) In order to achieve the scientific objectives, which require that the accuracy of the next-generation Earth gravity field models is at least one order of magnitude better than that of the current gravity models, the orbit design at an altitude of 300 +/- A 50 km is recommended for the future Improved-GRACE mission. This altitude is determined by a trade-off analysis between the recovery accuracy of the gravity field and the operational lifetime of the satellite system. (2) Because the accuracy of the Earth's gravitational field from NGGM with an orbital inclination of 96.78A degrees will be decreased due to a lack of the observation data in the polar areas, we propose that a near-polar orbit (inclination of 89A degrees A A +/- A 2A degrees) is a preferable selection for the future twin Improved-GRACE satellites. (3) The future Improved-GRACE mission has to adopt an inter-satellite range of 50 +/- A 10 km, because the common signals of the Earth's gravitational field between the twin NGGM satellites will be substantially eliminated with a shorter inter-satellite range of 10 km. With these orbit design parameters, the Earth's gravitational field from the Improved-GRACE mission is precisely recovered complete up to degree and order 120 with a cumulative geoid height error of about 0.7 mm.
机译：来自下一代重力测量任务（NGGM）和改进重力恢复和气候实验（Improved-GRACE）的地球引力场完整地达到了度数和阶数120，并通过使用325的不同轨道高度的闭环数值模拟进行了恢复。和300 km，不同的轨道倾角分别为96.78A和89A，以及10 km和50 km的卫星间距离。根据本研究的模拟结果，提出了未来的改进型GRACE双颗卫星的优选轨道参数。研究结果表明：（1）为了达到科学目的，要求下一代地球重力场模型的精度至少要比当前重力模型高一个数量级，因此轨道设计需要建议在未来的改进GRACE任务中将海拔300 +/- A 50 km。该高度通过重力场恢复精度与卫星系统使用寿命之间的折衷分析来确定。 （2）由于极地地区缺乏观测资料，NGGM的地球引力场的轨道倾角为96.78A度的精度会降低，因此我们建议采用近极轨道（倾角为89A度）。 AA +/- A 2A度）是未来两颗改良GRACE卫星的首选。 （3）未来的改良GRACE任务必须采用50 +/- A 10 km的星际射程，因为双星NGGM卫星之间的地球重力场的共同信号将被较短的星际卫星消除。射程10公里利用这些轨道设计参数，可以精确地恢复来自改良GRACE任务的地球重力场，直至达到度数和阶数120，累积大地水准面高度误差约为0.7毫米。

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